129193894 has 8 divisors (see below), whose sum is σ = 193883688. Its totient is φ = 64566000.

The previous prime is 129193891. The next prime is 129193907. The reversal of 129193894 is 498391921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129193891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9847 + ... + 18850.

It is an arithmetic number, because the mean of its divisors is an integer number (24235461).

Almost surely, 2^129193894 is an apocalyptic number.

129193894 is a deficient number, since it is larger than the sum of its proper divisors (64689794).

129193894 is a wasteful number, since it uses less digits than its factorization.

129193894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30950.

The product of its digits is 139968, while the sum is 46.

The square root of 129193894 is about 11366.3491940024. The cubic root of 129193894 is about 505.5304611265.

The spelling of 129193894 in words is "one hundred twenty-nine million, one hundred ninety-three thousand, eight hundred ninety-four".